Details on the proposals

Computationally intensive Web applications quickly demonstrate that the built-in JavaScript math library is missing basic functions such as cosh and log10 that have been available in other programming language platforms such as C++, .NET, Java, and Python for years. String and Number can also benefit from some basic functionality common to all modern programming language platforms like testing if a String starts with a specific substring or checking that a Number is an Integer. These are addressed in the proposed additions to the Math, String, and Number APIs.
Web applications have been harder to globalize than native applications because JavaScript has not provided native date and currency formats that the underlying OS has. The drop includes a reference implementation of the proposed Globalization APIs which enable applications to deal correctly with locale specific number and date formats and strings in other languages. With this library, developers can show date and numbers in the specified locale and set collation options for the purposes of sorting and searching strings. Developers can also set date and number formats to use alternate calendars like the Islamic calendar or to show a number as the Chinese Yuan currency. This means that JavaScript applications no longer have to round trip to the server to properly display locale specific dates and numbers, which ultimately translates to faster interactive applications for end-users.